<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*清除默认边距*/
        * {
            margin: 0;
            padding: 0;
        }
    </style>
</head>
<body>
<p>pppppp</p>
<h1>h1</h1>
<ul>
    <li>li</li>
</ul>
</body>
</html>